Add size_t length argument to v8::ArrayBuffer::Allocator::Free.

test/cctest/cctest.cc

Index: test/cctest/cctest.cc
diff --git a/test/cctest/cctest.cc b/test/cctest/cctest.cc
index 94dcce1305223f0f25f6e5456d0959b9f71e04a3..a2caf0f3baa7cfd9e8ec36c611803850f857d8f9 100644
--- a/test/cctest/cctest.cc
+++ b/test/cctest/cctest.cc
@@ -99,9 +99,10 @@ v8::Isolate* CcTest::default_isolate_;
 
 
 class CcTestArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
- public:
   virtual void* Allocate(size_t length) { return malloc(length); }
-  virtual void Free(void* data) { free(data); }
+  virtual void Free(void* data, size_t length) { free(data); }
+  // TODO(dslomov): Remove when v8:2823 is fixed.
+  virtual void Free(void* data) { UNREACHABLE(); }
 };